Extended High Frequency Audiometry in Pre-school Children

Changes in otoacoustic emissions and high-frequency hearing thresholds in children and adolescents

“…Many investigators have shown that the intersubject threshold variability at high frequencies increases as a function of frequency and also as a function of age, due to individual differences in the aging process and/or environmental influences (Fausti et al, 1981;Stelmachowicz et al, 1989;Schechter et al, 1986). In general, the hearing thresholds in the present study correspond to normative data obtained in other studies (Schechter et al, 1986;Reuter et al, 1997;Stelmachowicz et al, 1989;Schmuziger et al, 2005). The data of the present study demonstrate a gradual diminution of high-frequency sensitivity through adolescence and young adulthood.…”

“…However, in children and adolescents, hearing thresholds start to deteriorate at higher frequencies. Previous studies have demonstrated that children and young adults are able to detect signals up to 20-25 kHz (Osterhammel and Osterhammel, 1979;Schechter et al, 1986;Trehub et al, 1989;Buren et al, 1992;Reuter et al, 1997). Schechter et al (1986) confirmed the gradual diminution of highfrequency sensitivity from childhood through adolescence and into the young adult years.…”

“…The data of the present study demonstrate a gradual diminution of high-frequency sensitivity through adolescence and young adulthood. A loss of hearing sensitivity over the frequency range of 15-18 kHz, which starts at around 20 years of age, has been demonstrated by many authors (Schechter et al, 1986;Stelmachowicz et al, 1989;Trehub et al, 1989;Reuter et al, 1997). Hearing loss is usually thought to result from age-related changes in metabolism and in connective tissues, degeneration of the neurons of the cochlear nerve, and mechanical changes in the organ of Corti, which have adverse effects on the peripheral auditory structures, or degenerative changes in the major auditory pathways and centers of the brain (Brizzee et al, 1980;Trehub et al, 1989;Schuknecht and Gacek, 1993;Mazelova et al, 2003).…”

Pure-tone auditory threshold in school children

“…Some children with obvious acoustic trauma resulted from accidents with toy pistols or fire crackers were also excluded. Threshold levels higher than 20 dB HL were no exclusion causes as in other studies [3,26], because the distribution of normal hearing for children with higher levels especially at low frequencies would be cropped. In total, 197 otologically normal participants without acoustic trauma were screened.…”

Função coclear em frequências ultra-altas em pais de indivíduos com deficiência auditiva autossômica recessiva

“…A perda de sensibilidade auditiva na faixa de frequência de 15-18.000Hz começa em torno de 20 anos de idade, e tem sido demonstrado por muitos autores, como Schechter et al, 1986;Stelmachowicz et al, 1989;Trehub et al, 1989;Reuter et al, 1998. A DA, geralmente, é resultante de mudanças relacionadas à idade no metabolismo, degeneração do nervo coclear e alterações mecânicas no órgão espiral, com consequentes efeitos adversos sobre a função auditiva periférica e central (Brizzee et al, 1980;Trehub et al, 1989;Schuknecht e Gacek, 1993;Mazelova et al, 2003).…”